mm, /proc/pid/pagemap: fix soft dirty marking for PMD migration entry
authorHuang Ying <ying.huang@intel.com>
Thu, 2 Nov 2017 22:59:34 +0000 (15:59 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 3 Nov 2017 14:39:19 +0000 (07:39 -0700)
commitb83d7e432399d44454411dec5c25afb5c4469e96
tree14e38018a632c814c4910dc770f889d2e40f4e9c
parent1e3921471354244f70fe268586ff94a97a6dd4df
mm, /proc/pid/pagemap: fix soft dirty marking for PMD migration entry

When the pagetable is walked in the implementation of /proc/<pid>/pagemap,
pmd_soft_dirty() is used for both the PMD huge page map and the PMD
migration entries.  That is wrong, pmd_swp_soft_dirty() should be used
for the PMD migration entries instead because the different page table
entry flag is used.

As a result, /proc/pid/pagemap may report incorrect soft dirty information
for PMD migration entries.

Link: http://lkml.kernel.org/r/20171017081818.31795-1-ying.huang@intel.com
Fixes: 84c3fc4e9c56 ("mm: thp: check pmd migration entry in common path")
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: Daniel Colascione <dancol@google.com>
Cc: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/task_mmu.c